package com.zxjbyte.yiyi.framework.jackson.serializer;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.ser.std.NumberSerializer;

import java.io.IOException;

/**
 * @Author zhangxingjia
 * @Date 2023/3/1 17:53
 * @Version: 1.0
 */
@JacksonStdImpl
public class BigNumberSerializer extends NumberSerializer {
    /**
     * js 最大值为 Math.pow(2, 53)，十进制为：9007199254740992
     */
    private static final long JS_NUM_MAX = 0x20000000000000L;
    /**
     * js 最小值为 -Math.pow(2, 53)，十进制为：-9007199254740992
     */
    private static final long JS_NUM_MIN = -0x20000000000000L;
    /**
     * Static instance that is only to be used for {@link java.lang.Number}.
     */
    public final static BigNumberSerializer instance = new BigNumberSerializer(Number.class);

    public BigNumberSerializer(Class<? extends Number> rawType) {
        super(rawType);
    }

    @Override
    public void serialize(Number value, JsonGenerator gen, SerializerProvider provider) throws IOException {
        long longValue = value.longValue();
        if (longValue < JS_NUM_MIN || longValue > JS_NUM_MAX) {
            gen.writeString(value.toString());
        } else {
            super.serialize(value, gen, provider);
        }
    }
}
